Public Domain?

Does anybody have any good sources, knowledge, or advice on how to tell if a particular song is in the public domain or not?

Thanks hrh!

lol, it's all public domain until the BMI gets involves ;)

www.pdinfo.com/

Pretty comprehensive website

well, jerry jeff walker says it's all just public domain....
damn good question! i'm gonna find out if one of your loyal readers can't help.